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RookfDrill.

Patented Jam'.` 27, 1880.

NvENTon WWNESSES \W yg@ f 2SheetsJ-Sheet. 2. J. G. GRANSTON.

Rock-Drill.

No. 223,888. Patented Jan. 27, |880` FIG. 3

N. PETERS. PHUTD-UTHOGRAPHER. WASHINGTON. D. 2A

YUNITED STATES PATENT OFFICE.

JOHN GREY GRANSTON, OF NEWCASTLE-UPON-TYNE, ENGLAND.

ROCK-DRILL.

SPECIFICATION forming part of Letters Patent No. 223,888, dated January 27, Isso.

Application led August 19, 1879.

To all whom it may concern:

Be it known that I, J oHN G. OEANsToN, of NeWcastle-upon-Tyne, England, have invented an Improved Rock-Drill; and I hereby declare the following to be a full, clear, and exact description thereof.

My invention `relates to certain improvements in such machines as drill or cut rock lby the reciprocating action of the drilling or cutting tool attached to the piston-rod of a piston moved by steamer compressed air; and my improvements refer more particularly to the parts of such machines by which the drilling or cutting tool is rotated on its axis or is prevented from rotating, as is more fully described and claimed, and shown in the accompanying drawings, in which- Figure l is a horizontal section. Fig. 2 isa vertical cross-section through the line ce y of Fig. l. Fig. 3 is partly in plane and partly in horizontal section. Fig. 4t is a vertical cross-section through the line C D of Fig. 3; and Fig. 5 is a plan of the rotating tube with the cover removed.

The tube A is itted with one or more parallel grooves, ci, cut in the sides of said tube, as shown. The Lipper end of the piston-rod B is bored out to receive this tube A, the opening in the piston-rod having projections or flanges b, which t into and slide along the grooves et, for the purpose hereinafterl de-` scribed.

The top end of the tube A is held bya collar, c, moving freely in the box el, which is formed in the cover e. The top of the collar of the tube is recessed to receive the projections on` the bottom of the clutch f. The clutch f is also fitted with projections g, which slide in the parallel grooves It of the feedscrew i, the clutch f turning around freely on its axis when the feed-screw is turned.

The operation of the device is as follows: rI he rotary motion of the drilling-tool is produced on turning' the lever m of the feedscrew `when the clutch j' is in gear. The piston-rod with its attached tool is thus caused to rotate on its axis by means of the grooves in the feed-screw and tube acting upon the projections on the clutch and piston-rod. The

position of the grooves and projections may be reversedthat is, the tube may be tted with projections and the grooves be formed in the inside ofthe piston-rod-when the same results will be obtained.

If it is desired to prevent the tool from romtating, and to produce a slotting or cutting motion, the clutch fis thrown out of gear by means of levers jj and the pin le is inserted in the slot l in the collar e, which prevents the tube from turning on its axis, and consequently prevents the piston and cutting-tool from rotating.

In this device the drilling or cutting tool can be rotated to any degree with certainty at any part of the stroke of the piston rod.

in the casing F, as shown, and the whole-tube,

piston, and carriage-is moved forward by means of the feed-screw.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

In combination with the groovled tube A, fitting in the flanged hollowed piston-rod B, the recessed collar c, moving in the b'oX el, and the clutch j', With its projections g and levers j j', said clutch moving on the feed-screw i, and pin le, iitting into slot l, substantially as and for the purpose herein described.

In witness whereof I have hereunto set my hand.

JOHN GREY GRANSTON.

Witnesses: v

J osEPH W. SWAN,

Chemist, Mosley Street, Newcastle. REEs ROWLAND J oNEs,

6 Grey Street, Newcastle. I. C. FENWIGK,

A Commissioner, dta 

